This method is particularly suitable to ensure optimum bonding even on
smooth surfaces.
Spraying is recognized as the best method of application allowing
sharper sands and lower water content in the mortar mix. The speed
of work is considerably increased and an average of 1000 square feet
per day per man is quite normal. The pressurized application also
allows to build up the thickness of a layer to 1". The pressure
should not exceed 3.5 Bar*. Two coat work is normally sufficient with
the use of a spray gun.

Leave for a minimum of 4 days depending on weather conditions,
coat thickness and the plasterer's judgment.
Level using a straight edge and key with criss-cross pattern.
If this is also the finishing coat (3/4"-1"), depending
on the finish required, a finer sand can be used (#6 to #200 mesh).

2nd coat (finishing coat)

3/16"-5/16"

3/16"- 3/8"

3/16"-3/8"

NHL 3.5 @ 1: 2.5 or NHL 2 @ 1:2
Sands: #6 mesh down
Finer sands for wooden float or smooth finishes (#8 or finer) can
be used. In these cases the thickness should not be over 3/16".

Notes: background preparation as per good practice. Always dampen
surface before each application. On high suction background ensure
that this is thoroughly dampened (no standing water on surface),
if necessary several times, to minimise shrinkage.
Cure work for few days with water mist. Protect against rain, frost,
drying wind and direct sun for 2 to 7 days.
If dubbing out is required the mortar ratio should be the same as
the 1st coat. Leave dubbed out areas as sprayed to provide a key.

*Sablon S3 Hopper gun

Overall render thickness

3/4"- 1"**

1"-1 3/8"

up to 1 9/16"

On well keyed surfaces.
(raking joints not necessary)

(for thickness above 1 9/16"
please consult us.)

1st coat

3/8"-5/8"

3/8"- 5/8"

NHL 5 or NHL 3.5 @ 1: 1.5
Sands: well graded #4 down to #200 mesh

Trowel off high spots and leave 3-4 days as sprayed
to provide good key.

2nd coat

3/16"- 5/8"

3/8"- 5/8"

3/8"- 5/8"

NHL 5 @ 1:2.5 or NHL 3.5 @ 1:2
Sands: well graded #6 mesh down to #200
This can be the finishing coat for a 3/4"- 1" render. If
a smooth finish is required apply a 3rd coat as below.
Level using a straight edge and key with criss-cross patterns.

Leave about 7 days depending on weather conditions
and the plasterer's judgment.

NHL 3.5 @ 1: 2.5 or NHL 2 @ 1:2
Sands: depending on the finish required.
Finer sands for wooden float or smooth finishes (#8 or finer) can
be used. In these cases the thickness should not be over 3/16".

** This thickness can be achieved in one coat
(several passes) with suitable aggregates. Please consult us.

Notes: background preparation as per good
practice. Always dampen surface before each application. On high suction background
ensure that this is thoroughly dampened (no standing water), if necessary several
times, to minimise shrinkage.
Cure work for few days with water mist. Protect against rain, frost, drying wind
and direct sun for 2 to 7 days.
If dubbing out is required the mortar ratio should be the same as the 1st coat.
Leave dubbed out areas as sprayed to provide a key.

The information provided in these pages is of general nature only
and does not constitute a full specification.